Configuring TDP
TDP is configured through its commands. TDP commands which are always issued when TDP is started can be specified in a dataset allocated by a z/OS or VOS3 TDPPARM Data Definition (DD) statement in the TDP Job Control Language (JCL) or FILEDEF for TDPPARM. Such commands fall into two general categories: those that can only be issued from TDPPARM and those that can be issued anytime.
Those commands that can only be issued from TDPPARM have a unique command verb, INITIAL (refer to “TDP Operator Command Descriptions” on page 83 for a complete description). INITIAL commands can only be issued from TDPPARM because their settings are necessary for TDP to initialize. Since all settings have defaults, no INITIAL commands are required. But two such commands are often used.
z/OS, IOSDRIVR is recommended (it is not the default only because it is an undocumented z/OS interface, even though it has been fully stable and unchanged for many years).
All other TDP commands can be issued anytime TDP is running (refer to Chapter 7: “TDP Commands” for descriptions of all commands). Including those always issued in TDPPARM eliminates the need to manually issue the same commands every time TDP is started. Two commands are almost always specified.
Once the typical workload has been established, it is common to adjust the virtual storage used by TDP storage cells by including the TDP commands ADD CELLS and ADD XMSCELLS.